Well, in_cube plugin was superseded by VGMStream plugin, which still is actively developed. I'm not sure if newer versions of Winamp exist, but you can use that plugin with Winamp 5.5 or with any player compatible with Winamp plugin format (there are lots of them in the web). You can also just use test.exe app included with the plugin to get whatever supported file format you throw at it in .wav format...
Avell A70 MOB: Core i7-11800H, GeForce RTX 3060, 16 GB DDR4-3200, Windows 11 (Insider Preview)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)
